Free Online Stopwatch
Professional stopwatch with millisecond precision, lap counter, and split times. Free, accurate, and works everywhere — no signup required.
Pro Tips & Features
Need a Countdown? Popular Timers
One-click preset timers with a sound alarm — or set any duration on the countdown timer.
🎮 Play Free Games
Why Use Stopwatch.lol?
Millisecond Precision
Uses the browser's high-resolution Performance API for accurate millisecond timing every time.
Smart Lap Analysis
Record unlimited laps and let the stopwatch automatically surface your fastest, slowest, and average splits — then export the data as CSV.
Background Operation
Keeps running accurately even when you switch tabs or lock your screen.
All Devices
Fully responsive and touch-friendly — works on desktop, tablet, and mobile.
Free & Instant
No downloads, no registration, no fees. Open and start timing immediately.
Works Offline
Once loaded, the stopwatch works without an internet connection — no dropouts.
Frequently Asked Questions
Is this online stopwatch accurate?▾
Yes, Stopwatch.lol uses the browser's high-resolution Performance API (performance.now()) which provides sub-millisecond precision, making it highly accurate for sports timing, workouts, and productivity.
How precise is the stopwatch?▾
The stopwatch displays time to millisecond precision. It continues running accurately in the background even when you switch tabs, using timestamp-based calculations rather than interval counting.
Can I use this stopwatch on mobile devices?▾
Yes, the stopwatch is fully responsive and optimized for all devices including smartphones, tablets, and desktops with touch-friendly controls.
Does the stopwatch work offline?▾
Yes, once loaded, the stopwatch works offline and maintains accuracy even without an internet connection.
Can I record lap times and splits?▾
Yes, you can record unlimited lap times and view detailed split time analysis with our advanced timing features.
Is the stopwatch free to use?▾
Yes, Stopwatch.lol is completely free with no downloads, registration, or hidden fees required.
What is an AI stopwatch?▾
An AI stopwatch is a smart online stopwatch that goes beyond basic start and stop timing by automatically analyzing your results — calculating fastest, slowest, and average lap times, tracking split times, and turning raw numbers into insight without any manual math. Stopwatch.lol delivers this automatic lap and split analysis today, with AI-powered pacing insights in development.
Is Stopwatch.lol a smart or AI stopwatch?▾
Yes — Stopwatch.lol is a smart, high-precision online stopwatch. It automatically analyzes every session, showing your fastest, slowest, and average lap splits, and it lets you export lap data as CSV and auto-saves your session so it survives a refresh. Timing uses the browser's Performance API for millisecond accuracy. Deeper AI-powered features, such as automatic pacing suggestions, are on our roadmap. It is free, needs no signup, and works offline.